Cita APA (7a ed.)

Burchfield, R. W. (1989). Unlocking the English language. Faber and Faber.

Cita Chicago Style (17a ed.)

Burchfield, Robert W. Unlocking the English Language. London [etc.]: Faber and Faber, 1989.

Cita MLA (9a ed.)

Burchfield, Robert W. Unlocking the English Language. Faber and Faber, 1989.